Reports are coming in that attempts are being made to protect monuments all over Egypt in case antiquity looting breaks out. Many news media are mentioning that access to the pyramids is being prevented. I suspect this is not so much to protect the pyramids (and associated mastaba cemetery) as to keep adventurous tourists stuck in Cairo from wandering too far. To get to the pyramids they would have to cross an area where there has been a lot of unrest these past few days, and obviously the more scattered they are, the more difficult they are to protect (and protecting its visitors is one of the things the Egyptians are very serious about). In addition, the mastaba tombs and their reliefs are particularly vulnerable to looting (a la TT 15 Tomb of Tetiki style). Let us not forget that Zahi Hawass has a personal interest in the Giza cemeteries.
Ton Cremers, museumbeveiliging / Museum Security Network » Blog Archive » Egypt: Protecting Sites From Looting.